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	<title>Document</title>
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<body>
	<script type="text/javascript">
		var year = prompt("请输入你的出生年份");		//得到用户的输入
		var age = 2015 - year;							//计算年龄
		alert("哈哈，你今年" + age + "岁了，我聪明吧！！");	//输出
	</script>
</body>
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